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Volume 35 Issue 5
Sep 2021
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Chinese Journal of High Pressure Physics  > 2021  >  35(5): 055201.
LIU Yang, LI Zhan, FANG Qin, WANG Senpei, CHEN Li. Inert Gas and Water Vapor Suppressing Overpressure and Its Oscillation of Gas Explosion in Long Straight Space[J]. Chinese Journal of High Pressure Physics, 2021, 35(5): 055201. doi: 10.11858/gywlxb.20200654
Citation: LIU Yang, LI Zhan, FANG Qin, WANG Senpei, CHEN Li. Inert Gas and Water Vapor Suppressing Overpressure and Its Oscillation of Gas Explosion in Long Straight Space[J]. Chinese Journal of High Pressure Physics, 2021, 35(5): 055201. doi: 10.11858/gywlxb.20200654
shu

Inert Gas and Water Vapor Suppressing Overpressure and Its Oscillation of Gas Explosion in Long Straight Space

doi: 10.11858/gywlxb.20200654
  • 1.

    State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

  • 2.

    Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China

  • Received Date: 11 Dec 2020
  • Rev Recd Date: 13 Jan 2021
    Abstract
  • The overpressure and its oscillation of gas explosion in long straight space will endanger personnel and structures. In order to reduce the potential hazards, a numerical model of gas explosions in long straight tube was established based on the CFD software FLACS and was verified by using the existing experimental data. Based on the validated numerical models, the suppression of CO2, N2 and water vapor on the CH4/air mixture explosions with stoichiometric concentration was investigated. The influence of the volume fraction of inert gas and water vapor on the explosion overpressure and its oscillation was considered and discussed. It is shown that for every 10% increase in the volume fraction of CO2, water vapor and N2, the final overpressure of the gas explosion in the closed tube drops by 81, 47 and 65 kPa, the final overpressure in the end-vented tube decreases by 81, 47 and 65 kPa. When the volume fractions of CO2, water vapor and N2 are 25%, 26%, and 30%, respectively, the explosion is completely suppressed. CO2, water vapor and N2 can effectively suppress the oscillation of explosive overpressure, both the pressure amplitude and the pressure oscillation frequency decrease with the increase of the volume fraction of added gas. CO2 has the best suppression effect on explosion overpressure and its oscillation, followed by water vapor, and N2 is the weakest. This phenomenon is related to the differences in the physical properties of the three gases and the suppression mechanisms.

     

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